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258                                                                        RAPID POPULATION
progressing. This forward thrust is mainly a consequence of prices; new varieties of wheat, rice, and other crops that ; responsive; and the availability of more and cheaper fertilizer. 1 boom in tubewells and related water-lifting equipment. It shoi however, that the advances in agriculture could be brought to i countries were to return to the cheap food policies of the reci serious, widespread diseases or pests were to reduce the produi new varieties of crops.
I mentioned earlier that, as the modernization of agriculture contribution of land to agricultural production declines relative of the rest of the agricultural inputs. This process is a consec increases in the use of modern inputs that are purchased by fan set of inputs increases relative to that of land. This developmen agriculture becomes increasingly dependent upon other sectors, ported materials and services. It also implies that agricultural la the limitational factor', contrary to the Ricardo-Malthus approacl population (2, 9,10).
As a rule, the opportunity to modernize agriculture is very ui countries. The heterogeneity of agricultural production possi daily in large countries, sets the stage for serious income dispa marked differences in the population pressures among farming a words, the modernization of agriculture alters significantly the advantage of the agricultural areas within the country. Except f( countries such as Denmark, western countries have also not Clearly, parts of agriculture in Italy and France have long been d U.S.S.R., despite her centralized planning and administrated ec< spared, and the depressed Appalachia is poignant testimony of even agricultural development in the United States. Japan, how to have achieved a better record than have most western countri this problem (29).
Mexico and India illustrate the implications of this unequal Mexico, which is now well along into the third decade of succe ization of parts of her agriculture, faces increasingly serious inci among major agricultural areas. As the modernization of agricu and middle Mexico has progressed, the stagnant south has becc parison, a major depressed area. The internal migration from  south has profound effects on the redistribution of the Mexica In India the comparative advantage of agriculture is shifting to parts and to the major "rice bowls" of the southern parts as a cc modernization. A large triangle in central India is losing out c and many millions of people who are dependent upon agricul
this large area. Thev Will be left behind   The new fertiliypr-recnrvdex, the relative decline would be very much the same.)